This 1/2 hertz high selectivity filter was found in the December 1990 issue of Radio Electronics magazine. The source must be symmetrical. The capacitors can be changed for other frequencies.
This 100-second timer was found in a 2000 Poptronics. The magazine no longer exists, but the...
This circuit uses a photocell as sensor and a sensitive relay according the power supply voltage....
USB58xx and USB59xx Devices Integrate a 2:1 Multiplexer to Support Reversible Connection of USB...